Positron emission tomography : what it is

Positron emission tomography : what it is
PET, or positron emission tomography - a method of high-precision, fast and gives full information.But not all cities have a similar opportunity to diagnose, in addition, a method shown not all patients due to their nature and the relatively high cost.This is shown in such research, and where they are held?What you need to know about this method of investigation is PET?

Positron emission tomography - is the latest diagnostic research, which allows us not just to look inside the body and see the bodies of the picture and evaluate their work.

main objective of positron emission tomography is to obtain images in color specific chemical processes that occur in the affected area of ​​the patient body.

PET method is applicable when such serious diseases as cancer, neurological, psychiatric, and cardiac disease.

This complex study is used in the diagnosis of tumors, immediate and distant metastasis, when monitoring the effectiveness of cancer treatment.In the Cardiology

method used before the procedure,

coronary artery bypass surgery.In neurology and psychiatry - in the diagnosis of multiple sclerosis and Alzheimer's disease.

Feature of PET is the possibility of obtaining information on the level of metabolism in the cells, and it can detect cancers at an early stage.When tumor growth metabolic chemical processes of change, and, accordingly, will change and color intensity and color images.

Thus, the PET technique can detect the disease in its earliest stages, when no visible to the eye of structural change has not happened yet.

Pros of positron emission tomography

PET has a high accuracy of up to 95%.Due to such precision and complexity, depth of research, it can replace several other research methods - X-rays, puncture, MRI and CT.

When you hold it no pain or discomfort, no side effects, while it is possible to reach all organs and systems in one study.

This allows you to diagnose at an early stage, and to exclude ineffective in this case, or optional operational or medical methods of treatment.This method is practically harmless pet.

principle studies with positron emission tomography

Although the study and a radioactive drug is injected, conducting positron emission tomography safely.Such a radioactive drug is prepared in a special way and breaks down into inactive nonradiative particles within an hour.Doses during PET comparable to doses of radiation during the x-ray and computed tomography.When PET

registered blood flow in tissues and tissue glucose utilization and oxygen.In the body of the patient is administered a small amount of radioactive glucose that enters the tissue.This emits a specific drug is not visible to the human eye's rays, which are registered PET scanner and the information is transmitted to a computer.

computer processor processes the data, translating them in a graphical view and building the image on the monitor screen.The higher tissue capture radioactive drug, the image is brighter - these areas are called "hot", and conversely, the smaller the drug using the fabric, the obtained paler tissue sections - the "cold" zone.

in tumor tissue metabolism is much higher than normal, which makes it the most vivid picture of "hot" zones.That is why most of PET use is in the diagnosis of cancer processes, although it is used in other areas.

Application of PET in oncology

This method is the most modern and accurate in terms of detection, diagnosis and treatment of tumors, it can be used to detect cancer processes in the early stages, before the progression and metastasis of tumors.

Using PET can detect cancers smaller than 10 mm, the radioactive substances introduced into the body without harm to the body.The special value of this method is that it allows to select the most appropriate form of treatment, especially if it is the defeat of the lymphatic system.With chemotherapy, after its termination, it is possible according to the PET to evaluate the effectiveness of treatment.

Using PET detected such metastases are not visible to other diagnostic methods.Thus PET to determine the exact size and location of metastases. With this method it is possible to identify nodal involvement prior to their increase, which will build the correct therapy.But of course, other methods are used to confirm the diagnosis.

accuracy of the method is to 85-95%, while the accuracy of CT and MRI reaches only 70%, while they may not indicate recurrence or metastasis.

P When tumors of the lymphatic system PET replaces a whole series of investigations - CT and MRI, scintigraphy of the skeleton and other methods.This pet can share healthy and ill tissue, can distinguish between the processes of chronic inflammation of the Cancer growth.According to the obtained data on PET can be identified as the indications for surgery, so make it an optimal plan.

One big drawback of this study is its high cost and the lack of necessary equipment.In Russia, these scanners are very small, they are available only in large diagnostic centers in Moscow, St. Petersburg, Yekaterinburg.Queues for PET may be delayed for months, complicating the timely diagnosis.

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